Rotom formes unusable in Sun and Moon online battles?

Question

So with the Poké Bank update out for Sun and Moon, I transferred all my Pokémon over and decided to have a battle with my friends. One of the Pokémon I wanted to take was my Rotom-Fan, but the game kept telling me that there was an issue with it.

Are the Rotom formes not supported in Sun and Moon just yet? The Rotom is 100% legit, bred in Alpha Sapphire. All my other Pokémon were usable.

Comments

Rotom can change it's form in Professor Kukui's basement.  There is a pile of boxes filled with appliances towards the back.  Face them and press A, like in previous generations, to cycle through Rotom forms.

Edit:
For clarity, you're saying that PokeBank can't take Rotom-Fan?  Or that the battle functions of Quick Link and/or Festival Plaza won't take Rotom-Fan?

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Sometimes PokéBank acts funky and doesn't let legitimate Pokémon through.

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Also, there have been issues with legit Pokémon — like Alolan Raichu with Surf — not being allowed online. Your Rotom may have this problem.

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PhailRaptor, I transferred my Rotom-Fan from Alpha Sapphire through Poké Bank, and when I try to battle online with it I get a message that reads "There is one or more Pokémon that can't be used" or something like that.

Astronautical, I'm thinking that maybe because it was transferred in a different forme the game is registering it as a regular Rotom with Air Slash.  I'll revert it to its regular forme and back into Fan and see if that fixes this.

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Please read this: http://pokemondb.net/pokebase/meta/61562/what-should-we-do-for-these-questions-read-description

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Apologies for not responding after my test, I've been quite busy with things going on in life and genuinely forgot about this.  I received an email about your comment and here I am.

I took the Rotom-Fan over to Kukui's basement, reverted it into its standard forme, and then changed it back into Rotom-Fan.  I went to the Battle Tree to see if it would allow it, and it did.  I further tested this by switching it with my Rotom-Heat  (this was also transferred from Alpha Sapphire as Rotom-Heat, but I did not change its forme from Kukui), and it allows it as well.

I decided to test out Battle Spot and see if it would allow me to use Rotom-Fan (unfortunately no one is available for a local battle so I can test under the same circumstances).  The Battle Spot (free battle, special Pokémon allowed) allowed my Rotom-Fan to be used.  Rotom-Heat was also allowed.  The results were the same for Ranked Battle Spot.  For what I know there were no recent updates for Sun and Moon.  I can do a local Link Battle on Thursday (the 16th) so I will see what happens there.  I'll post my update later that day.

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I did the further testing with Link Battles, and the result was the same with the Battle Tree and Battle Spot.  Both Rotom-Fan and Rotom-Heat were allowed to be used.  I'm thinking that there was either a hotfix that was done to the game (one that didn't require an update) that allows Rotom formes to be used, OR Sun and Moon online weren't updated to support some Poké Bank Pokémon (which I believe is not the case as I could use the anniversary Mew with no issues).

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@Distorted_Pakia He provided enough information.

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It has nothing to do with what form you transferred it over as cause i transferred my Rotom Mow form from Pokémon X, it didn't work at first cause it had an invalid item, I changed it to a quick claw and my Rotom Mow was able to be used in all battle formats

Answer 1

From what I can tell, this question has already been resolved by you in the comments. Just answering this to get it off of the unanswered list.

Apologies for not responding after my test, I've been quite busy with things going on in life and genuinely forgot about this. I received an email about your comment and here I am.

I took the Rotom-Fan over to Kukui's basement, reverted it into its standard forme, and then changed it back into Rotom-Fan. I went to the Battle Tree to see if it would allow it, and it did. I further tested this by switching it with my Rotom-Heat (this was also transferred from Alpha Sapphire as Rotom-Heat, but I did not change its forme from Kukui), and it allows it as well.
I decided to test out Battle Spot and see if it would allow me to use Rotom-Fan (unfortunately no one is available for a local battle so I can test under the same circumstances). The Battle Spot (free battle, special Pokémon allowed) allowed my Rotom-Fan to be used. Rotom-Heat was also allowed. The results were the same for Ranked Battle Spot. For what I know there were no recent updates for Sun and Moon. I can do a local Link Battle on Thursday (the 16th) so I will see what happens there. I'll post my update later that day.
commented Mar 15 by Vundervaffle

I did the further testing with Link Battles, and the result was the same with the Battle Tree and Battle Spot. Both Rotom-Fan and Rotom-Heat were allowed to be used. I'm thinking that there was either a hotfix that was done to the game (one that didn't require an update) that allows Rotom formes to be used, OR Sun and Moon online weren't updated to support some Poké Bank Pokémon (which I believe is not the case as I could use the anniversary Mew with no issues).
commented Mar 17 by Vundervaffle